Abstract
Alumina and alumina + 1 vol.% carbon nanotube (CNT) composites were fully densified by spark plasma sintering. Post-sintering heat treatments (1300–1500 °C) were performed to completely oxidize CNTs and then densify the remaining 1 vol.% to produce fine-grained ceramics. The grain size and Vickers hardness of the heat-treated composites were compared with the monolithic alumina sintered without CNT addition. Compared to the initial powder particle size of alumina (D50: 356 ± 74 nm), minimal grain growth (∼450 nm) was observed for the fully dense heat-treated composites. A 25% improvement in Vickers hardness and >10 times finer average grain size were observed for alumina produced by the heat treatment (1300 °C) of alumina + 1 vol.% CNT composite, compared to alumina sintered without CNTs.
| Original language | English |
|---|---|
| Pages (from-to) | 2853-2859 |
| Journal | Journal of the European Ceramic Society |
| Volume | 31 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - 2011 |
Keywords
- SPS/FAST
- sintering
- grain growth
- grain size
- alumina
- carbon nanotubes
- hardness
- nanocomposite